Improvement in clock-escapements



R. S. ABERNETHY. Glock-Esoapemen t.

Patented Nov. 11,1879.

No.-22l,490.

E TOR 387 wJ-r- ATTORNEYS WITNESSES UNITED STATES PATENT OFFICE ROBERT S. ABERNETHY, OF HAPPY HOME, NORTH CAROLINA.

IMPROVEMENT IN CLOCK-ESCAPEMENTS.

Specification forming part of Letters Patent No. 221,490, dated November 11, 1879; application filed September 26, 1879.

To all whom "it may concern:

Be it known that I, ROBERT S. ABERNETHY, of Happy Home, in the county of Burke, and in the State of North Carolina, have invented certain new and useful Improvements in 01001:- Escapements; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

The nature of my invention consists in the construction and arrangement of a clock-escapement, as will be hereinafter more fully set forth. v

In the annexed drawings, Figure l is a front view, and Fig. 2 a side view, of my improved clock-escapement. Fig. 3 sh ows a modification of the same.

A represents the frame of a clock. Bis the escapement-arni, pivoted at a, and having its upper end forked, the two prongs b b being spaced to correspond to the diameter of an eccentric, d, 011 the end of the main shaft D. The escapenient-arm B is provided with a series of holes, a", for changing the pivot to aid in regulating the length of the vibration in connection with elevating or lowering the bob on the pendulum-wire.

O is the 1i)endulu-m-wire, pivoted at i, which is also provided with a series of holes, y, for changing the position of the spiral spring F, which connects said wire with the arm B. By elevating the spring F the length of vibration will be shorter, and by lowerin the spring it will be longer.

The pendulum-bob G should be adjustable on the wire O.

The shaft D takes the place of the escapement wheel and shaft in clocks now in use, and on said shaft are to be six, eight, or more cogs to connect with a system of wheels similar to those already in use, except that the shaft D must rotate faster than the corresponding shaft in other systems, since there can be but two strokes of the pendulum to each revolution of the shaft.

The spiral spring F should be of such material as to allow the pendulum to continue its vibrations for a while after the clock runs down.

In Fig. 3 I have shown a modification of the escapeinent-arm, consisting in extending the arm itself to form a spring, which is to spring in unison with the pendulum-wire, which wire is to be of the style already in use, and attached to the front part of the clock frame.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In a pendulum-clock, the combination of the shaft D, provided with the eccentric d, the forked escapement-bar B, and a spring connecting said bar with the pendulum, substantially as and for the purposes herein set forth. In testimony that I claim the foregoing I have hereunto set my hand this 5th day of September, 1879.

ROBT. S. ABERNETHY. Witnesses:

HENRY L. OAPUs, H. A. ABERNETHY. 

